TITLE

Sequential determination of free and total cyanide by flow injection

AUTHOR(S)
Angelica, Maria; Marin, Bonadiman; Ganzarolli, Edgard Moreira; Lehmkuhl, Arilson; Souza, Ivan Goncalves De; Roosevelt, Roldao; Queiroz, Urzedo De
PUB. DATE
January 1999
SOURCE
Journal of Automated Methods & Management in Chemistry;Jan1999, Vol. 21 Issue 1, p23
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This study presents a flow injection system for the sequential determination of free (CN-) and total (CN- HCN) cyanide using a potentiometric method which employs two different processes for the determination of these two chemical species. The first process is based on direct detection of CN- using an ion-selective electrode for cyanide. In the second process, the sample is mixed with acid, and the released HCN is transferred across a PT FE membrane. The flow system employs three solenoid valves, a gas diffusion chamber, an ion-selective electrode, a potentiometer, and a computer with an A/D conversion card. A Turbo Pascal computer program automatically performs all the steps involved in data acquisition and processing. The standard deviation for the results obtained with the proposed method was 0.5%.
ACCESSION #
3861138

 

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